Reland of mojo VR interface simpified.

device/vr/vr_device_manager.h

Index: device/vr/vr_device_manager.h
diff --git a/device/vr/vr_device_manager.h b/device/vr/vr_device_manager.h
index 2a3bc206dcd916391a4cc8821b476dd8fe1ca1bc..b8b9fdaf10eb2c6a96458023398321bbd2715327 100644
--- a/device/vr/vr_device_manager.h
+++ b/device/vr/vr_device_manager.h
@@ -15,7 +15,6 @@
 #include "base/memory/linked_ptr.h"
 #include "base/threading/thread_checker.h"
 #include "base/timer/timer.h"
-#include "device/vr/vr_client_dispatcher.h"
 #include "device/vr/vr_device.h"
 #include "device/vr/vr_device_provider.h"
 #include "device/vr/vr_export.h"
@@ -25,36 +24,20 @@
 
 namespace device {
 
-class VRDeviceManager : public VRClientDispatcher {
+class VRDeviceManager {
  public:
   DEVICE_VR_EXPORT virtual ~VRDeviceManager();
 
   // Returns the VRDeviceManager singleton.
   static VRDeviceManager* GetInstance();
 
-  // Gets a VRDevice instance if the specified service is allowed to access it.
-  DEVICE_VR_EXPORT static VRDevice* GetAllowedDevice(VRServiceImpl* service,
-                                                     unsigned int index);
-
   // Adds a listener for device manager events. VRDeviceManager does not own
   // this object.
   void AddService(VRServiceImpl* service);
   void RemoveService(VRServiceImpl* service);
 
-  DEVICE_VR_EXPORT mojo::Array<VRDisplayPtr> GetVRDevices();
-
-  // Manage presentation to only allow a single service and device at a time.
-  DEVICE_VR_EXPORT bool RequestPresent(VRServiceImpl* service,
-                                       unsigned int index,
-                                       bool secure_origin);
-  DEVICE_VR_EXPORT void ExitPresent(VRServiceImpl* service, unsigned int index);
-  void SubmitFrame(VRServiceImpl* service, unsigned int index, VRPosePtr pose);
-
-  // VRClientDispatcher implementation
-  void OnDeviceChanged(VRDisplayPtr device) override;
-  void OnDeviceConnectionStatusChanged(VRDevice* device,
-                                       bool is_connected) override;
-  void OnPresentEnded(VRDevice* device) override;
+  DEVICE_VR_EXPORT bool GetVRDevices(VRServiceImpl* service);
+  DEVICE_VR_EXPORT unsigned int GetNumberOfConnectedDevices();
 
  private:
   friend class VRDeviceManagerTest;
@@ -89,10 +72,6 @@ class VRDeviceManager : public VRClientDispatcher {
   using ServiceList = std::vector<VRServiceImpl*>;
   ServiceList services_;
 
-  // Only one service and device is allowed to present at a time.
-  VRServiceImpl* presenting_service_;
-  VRDevice* presenting_device_;
-
   // For testing. If true will not delete self when consumer count reaches 0.
   bool keep_alive_;